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Basic Info
CAS Number
N/A
Pharmacopoeia
ChP
Grade
In-house Standards
Is Manufacturer
YES
Packaging & Delivery
Minimum Order Quantity
Any
Delivery Cycle
Negotiable
Product Description
Reference Standards &Impurity
AI Product Description
*The following content is generated by AI and is for reference only.
Acid Red is a broad designation for a class of water-soluble anionic dyes primarily utilized in the textile industry, though the term often refers specifically to Acid Red 18 (also known as Fast Red E) or similar azo-based compounds. These dyes are characterized by their intense red hues and excellent affinity for protein fibers such as wool, silk, and nylon, as well as modified acrylics. The molecular structure typically features multiple sulfonic acid groups attached to an aromatic azo backbone, which ensures high solubility in water and strong binding capabilities under acidic conditions.
The specific CAS number varies depending on the exact variant within the Acid Red family. For instance, Acid Red 18 carries the CAS number 563-62-8, while Acid Red 1 has the CAS number 609-76-5. Their general molecular formulae usually follow the pattern C₁₆H₁₁N₂NaO₇S₂ or similar derivatives, reflecting the presence of sodium salts that facilitate dissolution. These chemicals are synthesized through diazotization and coupling reactions involving aromatic amines and naphthols, resulting in vibrant colorants that resist fading under standard washing conditions when properly fixed.
In terms of applications, Acid Reds are indispensable in dyeing natural protein fibers and synthetic polyamides. They are extensively used in the production of garments, carpets, leather goods, and paper products where deep, rich red shades are required. The dyeing process generally occurs in an acidic bath at temperatures ranging from 80°C to 100°C, allowing the dye molecules to penetrate the fiber matrix effectively. Beyond textiles, some variants find niche uses in cosmetic formulations, biological staining, and ink manufacturing. However, environmental regulations increasingly scrutinize azo dyes due to potential toxicity concerns regarding aromatic amine degradation. Consequently, modern industrial practices emphasize strict wastewater treatment protocols to prevent ecological contamination. Despite these challenges, the versatility, cost-effectiveness, and colorfastness of Acid Reds ensure their continued prominence in global chemical markets, serving as a cornerstone for the vibrant coloration of everyday consumer goods.
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